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So any news about the low-noise propellers for the spark?
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<blockquote data-quote="suprPHREAK" data-source="post: 37801" data-attributes="member: 1505"><p>You are correct. The swept blade functions exactly the same, reducing turbulence off the tip of the wing (blade), thus reducing noise. Also enhances efficiency, as that turbulence is also drag.</p><p></p><p></p><p></p><p>The only reason they are upturned on airliners is to keep the wing shorter to fit more airports, and even then, only on the smallest planes now have it (Boeing 737, for example, is for small airports). Bigger planes, such as 747/767/777/787 all use raked tips, like the Mavic props. They only serve bigger airports, so size is less of a concern. That said, the new 777X has a wing 7 metres longer than its predecessor, longer even than the bigger 747-8, and so its wingtips fold up, like the wings on a Navy fighter jet.</p></blockquote><p></p>
[QUOTE="suprPHREAK, post: 37801, member: 1505"] You are correct. The swept blade functions exactly the same, reducing turbulence off the tip of the wing (blade), thus reducing noise. Also enhances efficiency, as that turbulence is also drag. The only reason they are upturned on airliners is to keep the wing shorter to fit more airports, and even then, only on the smallest planes now have it (Boeing 737, for example, is for small airports). Bigger planes, such as 747/767/777/787 all use raked tips, like the Mavic props. They only serve bigger airports, so size is less of a concern. That said, the new 777X has a wing 7 metres longer than its predecessor, longer even than the bigger 747-8, and so its wingtips fold up, like the wings on a Navy fighter jet. [/QUOTE]
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So any news about the low-noise propellers for the spark?